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TES: The largest network of teachers in the world
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- Some materials can be permanently magnetized with an electrical current.
- cut strips of cassette tape, magnetize them, set up a digital code, move permanent magnet by to deflect up or down.
- demonstrate magnetizer
- Hard drive dissection/mapping, including currents produce motion, and magnets can be shielded.
- Moving magnets can generate electrical currents. (induction)
- Demonstrations with magnets, multimeters, and coils.
- Secret Life of Machines on VCRs
- Some materials can release electrical charge when illuminated. (photoelectric effect)
- phet simulation on conductivity
- cadmium sulfide photocells, lasers, and multimeters
- CD players dissected
- mirrors, electrical tape, lasers, photocells make a barcode and reader
- Analog codes use patterns that allow continuous variation.
- phonograph records
- A-D, D-A conversion worksheet
- Digital codes use patterns that allow only discontinuous values.
- binary numbers, ASCII code
I started with a digital code, then went to photocells/CDs, then to magnetic induction/audiotape, then back to A-D, D-A conversions.